<template>
  <div class="upload-box">
    <el-upload
      :id="uuid"
      action="#"
      :class="['upload', self_disabled ? 'disabled' : '', drag ? 'no-border' : '']"
      :multiple="false"
      :disabled="self_disabled"
      :show-file-list="false"
      :http-request="handleHttpUpload"
      :before-upload="beforeUpload"
      :on-success="uploadSuccess"
      :on-error="uploadError"
      :drag="drag"
      :accept="fileType.join(',')"
    >
      <template v-if="imageUrl">
        <img :src="imageUrl" class="upload-image" />
        <div class="upload-handle" @click.stop>
          <div v-if="!self_disabled" class="handle-icon" @click="editImg">
            <el-icon><Edit /></el-icon>
            <span>编辑</span>
          </div>
          <div class="handle-icon" @click="imgViewVisible = true">
            <el-icon><ZoomIn /></el-icon>
            <span>查看</span>
          </div>
          <div v-if="!self_disabled" class="handle-icon" @click="deleteImg">
            <el-icon><Delete /></el-icon>
            <span>删除</span>
          </div>
        </div>
      </template>
      <template v-else>
        <div class="upload-empty">
          <slot name="empty">
            <el-icon><Plus /></el-icon>
            <!-- <span>请上传图片</span> -->
          </slot>
        </div>
      </template>
    </el-upload>
    <div class="el-upload__tip">
      <slot name="tip"></slot>
    </div>
    <el-image-viewer v-if="imgViewVisible" :url-list="[imageUrl]" @close="imgViewVisible = false" />
  </div>
</template>

<script setup lang="ts" name="UploadImg">
  import { ref, computed, inject } from "vue"
  import { generateUUID } from "@/utils"
  import { uploadImg } from "@/api/modules/upload"
  import { ElNotification, formContextKey, formItemContextKey } from "element-plus"
  import type { UploadProps, UploadRequestOptions } from "element-plus"

  interface UploadFileProps {
    imageUrl: string // 图片地址 ==> 必传
    api?: (params: any) => Promise<any> // 上传图片的 api 方法，一般项目上传都是同一个 api 方法，在组件里直接引入即可 ==> 非必传
    drag?: boolean // 是否支持拖拽上传 ==> 非必传（默认为 true）
    disabled?: boolean // 是否禁用上传组件 ==> 非必传（默认为 false）
    fileSize?: number // 图片大小限制 ==> 非必传（默认为 5M）
    fileType?: File.ImageMimeType[] // 图片类型限制 ==> 非必传（默认为 ["image/jpeg", "image/png", "image/gif"]）
    height?: string // 组件高度 ==> 非必传（默认为 150px）
    width?: string // 组件宽度 ==> 非必传（默认为 150px）
    borderRadius?: string // 组件边框圆角 ==> 非必传（默认为 8px）
  }

  // 接受父组件参数
  const props = withDefaults(defineProps<UploadFileProps>(), {
    imageUrl: "",
    drag: true,
    disabled: false,
    fileSize: 5,
    fileType: () => ["image/jpeg", "image/png", "image/gif"],
    height: "150px",
    width: "150px",
    borderRadius: "8px"
  })

  // 生成组件唯一id
  const uuid = ref("id-" + generateUUID())

  // 查看图片
  const imgViewVisible = ref(false)
  // 获取 el-form 组件上下文
  const formContext = inject(formContextKey, void 0)
  // 获取 el-form-item 组件上下文
  const formItemContext = inject(formItemContextKey, void 0)
  // 判断是否禁用上传和删除
  const self_disabled = computed(() => {
    return props.disabled || formContext?.disabled
  })

  /**
   * @description 图片上传
   * @param options upload 所有配置项
   * */
  interface UploadEmits {
    (e: "update:imageUrl", value: string): void
  }
  const emit = defineEmits<UploadEmits>()
  const handleHttpUpload = async (options: UploadRequestOptions) => {
    let formData = new FormData()
    formData.append("file", options.file)
    try {
      const api = props.api ?? uploadImg
      const { data } = await api(formData)
      emit("update:imageUrl", data.fileUrl)
      // 调用 el-form 内部的校验方法（可自动校验）
      formItemContext?.prop && formContext?.validateField([formItemContext.prop as string])
    } catch (error) {
      options.onError(error as any)
    }
  }

  /**
   * @description 删除图片
   * */
  const deleteImg = () => {
    emit("update:imageUrl", "")
  }

  /**
   * @description 编辑图片
   * */
  const editImg = () => {
    const dom = document.querySelector(`#${uuid.value} .el-upload__input`)
    dom && dom.dispatchEvent(new MouseEvent("click"))
  }

  /**
   * @description 文件上传之前判断
   * @param rawFile 选择的文件
   * */
  const beforeUpload: UploadProps["beforeUpload"] = (rawFile) => {
    const imgSize = rawFile.size / 1024 / 1024 < props.fileSize
    const imgType = props.fileType.includes(rawFile.type as File.ImageMimeType)
    if (!imgType)
      ElNotification({
        title: "温馨提示",
        message: "上传图片不符合所需的格式！",
        type: "warning"
      })
    if (!imgSize)
      setTimeout(() => {
        ElNotification({
          title: "温馨提示",
          message: `上传图片大小不能超过 ${props.fileSize}M！`,
          type: "warning"
        })
      }, 0)
    return imgType && imgSize
  }

  /**
   * @description 图片上传成功
   * */
  const uploadSuccess = () => {
    ElNotification({
      title: "温馨提示",
      message: "图片上传成功！",
      type: "success"
    })
  }

  /**
   * @description 图片上传错误
   * */
  const uploadError = () => {
    ElNotification({
      title: "温馨提示",
      message: "图片上传失败，请您重新上传！",
      type: "error"
    })
  }
</script>

<style scoped lang="scss">
  .is-error {
    .upload {
      :deep(.el-upload),
      :deep(.el-upload-dragger) {
        border: 1px dashed var(--el-color-danger) !important;
        &:hover {
          border-color: var(--el-color-primary) !important;
        }
      }
    }
  }
  :deep(.disabled) {
    .el-upload,
    .el-upload-dragger {
      cursor: not-allowed !important;
      background: var(--el-disabled-bg-color);
      border: 1px dashed var(--el-border-color-darker) !important;
      &:hover {
        border: 1px dashed var(--el-border-color-darker) !important;
      }
    }
  }
  .upload-box {
    .no-border {
      :deep(.el-upload) {
        border: none !important;
      }
    }
    :deep(.upload) {
      .el-upload {
        position: relative;
        display: flex;
        align-items: center;
        justify-content: center;
        width: v-bind(width);
        height: v-bind(height);
        overflow: hidden;
        border: 1px dashed var(--el-border-color-darker);
        border-radius: v-bind(borderRadius);
        transition: var(--el-transition-duration-fast);
        &:hover {
          border-color: var(--el-color-primary);
          .upload-handle {
            opacity: 1;
          }
        }
        .el-upload-dragger {
          display: flex;
          align-items: center;
          justify-content: center;
          width: 100%;
          height: 100%;
          padding: 0;
          overflow: hidden;
          background-color: transparent;
          border: 1px dashed var(--el-border-color-darker);
          border-radius: v-bind(borderRadius);
          &:hover {
            border: 1px dashed var(--el-color-primary);
          }
        }
        .el-upload-dragger.is-dragover {
          background-color: var(--el-color-primary-light-9);
          border: 2px dashed var(--el-color-primary) !important;
        }
        .upload-image {
          width: 100%;
          height: 100%;
          object-fit: contain;
        }
        .upload-empty {
          position: relative;
          display: flex;
          flex-direction: column;
          align-items: center;
          justify-content: center;
          font-size: 12px;
          line-height: 30px;
          color: var(--el-color-info);
          .el-icon {
            font-size: 28px;
            color: var(--el-text-color-secondary);
          }
        }
        .upload-handle {
          position: absolute;
          top: 0;
          right: 0;
          box-sizing: border-box;
          display: flex;
          align-items: center;
          justify-content: center;
          width: 100%;
          height: 100%;
          cursor: pointer;
          background: rgb(0 0 0 / 60%);
          opacity: 0;
          transition: var(--el-transition-duration-fast);
          .handle-icon {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 0 6%;
            color: aliceblue;
            .el-icon {
              margin-bottom: 40%;
              font-size: 130%;
              line-height: 130%;
            }
            span {
              font-size: 85%;
              line-height: 85%;
            }
          }
        }
      }
    }
    .el-upload__tip {
      line-height: 18px;
      text-align: center;
    }
  }
</style>
